c-brain-glass/app/src/main/java/com/nova/brain/glass/helper/BitmapDecodeHelper.kt

package com.nova.brain.glass.helper

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import kotlin.math.max

object BitmapDecodeHelper {
    fun decodeSampledBitmap(path: String, reqWidth: Int, reqHeight: Int): Bitmap? {
        val boundsOptions = BitmapFactory.Options().apply {
            inJustDecodeBounds = true
        }
        BitmapFactory.decodeFile(path, boundsOptions)

        val decodeOptions = BitmapFactory.Options().apply {
            inSampleSize = calculateInSampleSize(boundsOptions, reqWidth, reqHeight)
            inPreferredConfig = Bitmap.Config.RGB_565
        }
        return BitmapFactory.decodeFile(path, decodeOptions)
    }

    private fun calculateInSampleSize(
        options: BitmapFactory.Options,
        reqWidth: Int,
        reqHeight: Int
    ): Int {
        val height = options.outHeight
        val width = options.outWidth
        if (height <= 0 || width <= 0 || reqWidth <= 0 || reqHeight <= 0) {
            return 1
        }
        var inSampleSize = 1
        if (height > reqHeight || width > reqWidth) {
            val halfHeight = height / 2
            val halfWidth = width / 2
            while (halfHeight / inSampleSize >= reqHeight && halfWidth / inSampleSize >= reqWidth) {
                inSampleSize *= 2
            }
        }
        return max(1, inSampleSize)
    }
}